And finally tonight Hollywood learned something this weekend never underestimate the power of a story about taking that chance in the time you have. It is a love story no special effects have -- it's a blockbuster earning 48 million dollars and Tom Cruise and his -- -- attacks. Earned just 29 million. ABC's John Donvan now tells us about a message that may live for ever. Exploration. That this weekend the girl in the movie -- opinion is beautiful. Wiesel who laughed and loved and lived with cancer -- ministers -- -- -- cancer story your real story came from John green's best seller the fault in our stars. Which had its own inspiration someone named. -- girl who was not hazel because Astor was real she was a little girls in the 1990s. And then she. And then she got sick with cancer and save -- chairman John Green when he was already a famous author and she was a fan. Guess it was an amazing -- she was astonishingly. Empathetic she's really thoughtful and very funny. He says it was that spirit and -- that inspired him to invent hazel. And -- insight wonderful life to know it might not happen what you -- to passengers videos later reminders of liberty -- line. How it. And not -- -- -- gotten -- on the net and always great and you questionnaire. Jon says you know as to time that a short life can be good life. Meaningful life and he -- right. It was short Astor died almost four years ago at sixteen never seen which she inspired in this determines -- nearly -- -- A movie her mom told -- she would love this kid this young woman who did not get to go past young. John Donvan ABC news Washington. And -- parents said they think she might have seen the movie twice.

This transcript has been automatically generated and may not be 100% accurate.